pbatt



(No Model.)

N. W. PRATT.

OONNEGTING BOX FOR SEGTIONAL STEAM BOILERS. N0. 368,610. Patented Aug.23, 1887.

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tries.

NAT. W. PRATT, OF BROOKLYN, NEW YORK.

CONNECTING BOX FOR SEGTIONAL STEANl OILER9.

SPECIFICATION forming part of Letters Patent No. 388,610, dated August23, 1887.

Application filed March 3, 1887. Serial No. 229,569. (No model.)

To all whom it may concern:

v Be it known that I, NAT. W. PRATT, a citizen of the United States,residing at Brooklyn,

county of Kings, and State of New York, have 5 invented certain new anduseful Improvements in Connecting-Boxes for Sectional Steam-Boilers, ofwhich the following is a specification.

This invention relates to the construction of boxes for use in making aconnection between a drum and a series of water-tubes of sectionalwater-tube steam-boilers; and the said invention consists in applyingcertain novel features of construction to the said boxes for the purposeof producing them from wrought metal. [5 In order to enable othersskilled in the art to which my invention appertains to understand anduse the same, I will proceed to describe the features of itsconstruction, having reference to the accompanying drawings, andsubsequently point out in the appended claims its novel characteristics.

Figure 1 is an end elevation of a part of a drum and box connected inposition thereto; Fig. 2, a central vertical section on the line 00,Fig. 1; Fig. 3, a partial plan view of the connecting-box detached fromthe drum, Fig. 4, a cross-section on the line y y, Figs. 1 and 3, viewedin a direction opposite to that of Fig. 2; and Fig. 5, a central sectionof a part of the connectingboxand drum taken on the line 22, Figs. 2 and3.

The present construction consists in pressing from a sheet of wroughtmetal an open box, A, having a perimeter, a, for the recep tion of aflanged tube-sheet, A, and in pressing upon the top or back of the saidopen box a saddle depression, 0, made to fit the curvature of the sideof a drum, B. The saddle depression andadjacent side of the drum havecorresponding perforations b, in which nipples c areinserted forconnecting the said parts together and establishing communication.

The saddledepression 0 presents in plan view an approximate oval form,bulging at f, 5 Figs. 1 and 2, which offers an increased flattenedsurface for the reception of numerous perforations b.

The upper sides, 9, of the box A are preferably inclined or converged atan angle toward the ends for compactness of form.

The tube-sheet A presents at the bottom of the manifold a flat surface,(I, having perforations e for the reception of water-tubes. For thepurpose of entering the tubes at an angle other thana right angle to theaxis of the drum the said flat surface maybe inclined in eitherdirection to the said axis, or it may be parallel therewith.

In another application filed simultaneously herewith, Serial No.229,576, the special con struction shown in Fig. 5 of the presentapplication is included in claims 6 and 7 of said other application.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A wrought-metal connecting-box for water-tube boilers, made of twopieces, a saddleboX and a tube-sheet, riveted or welded together withsubstantially parallel sides swelled into an approximate oval where itjoins the drum, substantially as specified.

2. Awrought-metal connectingbox for wator-tube boilers, having asaddle-box and tubesheet, riveted together with substantially parallelsides swelled into an approximate oval 7 where it joins the drum, andprovided with perforations in the saddle-face, through which it may besecured to and made to connect with a drum by nipples fixed in saidperforations, substantially as specified.

3. A wrought-metal connection for water tube boilers, having two sidessubstantially parallel through a great part of their surface, anapproximately oval top perforated for tubes and curved to fit a drum,and a perforated 85 bottom, substantially as specified.

NAT. \V. PRATT.

Witnesses:

OHAs. W. FoRBEs, AUG. GREvELING.

